A sexual act, similar to cunnilingus, wherein the 'performer' places the backs of both hands to their cheeks and inserts all of their fingers and their tongue into the female genitalia, and shouts "blarffl" in an impression of the eponymous villain from the 1987 Arnold Schwarzenegger classic 'Predator'.
To wear your hair in a manner similar to Doug Gabriel, formerly of Oakland Raiders. i.e. a hairstyle similar to that worn by the Predator; a corn row mullet